package com.bcqn.utils;

import lombok.extern.slf4j.Slf4j;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * IP工具类
 * @author Kelly
 * @date 2019/11/14 16:48
 * @version 0.1
 */
@Slf4j
public class IpUtil {

    final static String UNKNOWN = "unknown";
    final static String LOCAL_HOST = "127.0.0.1";
    /**
     * 获取客户端IP地址
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            if (LOCAL_HOST.equals(ip)) {
                //根据网卡取本机配置的IP
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ip = inet.getHostAddress();
            }
        }
        // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        int len = 15;
        if (ip != null && ip.length() > len) {
            String comma = ",";
            if (ip.indexOf(comma) > 0) {
                ip = ip.substring(0, ip.indexOf(","));
            }
        }

        String defaultMac = "0:0:0:0:0:0:0:1";
        if (defaultMac.equals(ip)) {
            ip = "127.0.0.1";
        }

        return ip;
    }

    /**
     * 获取客户端主机名称
     */
    public static String getHostName() {
        try {
            return InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
            log.error("getHostName error:{}",e);
        }
        return "未知";
    }
}
